This Tariff Concession Order (TCO 0930817) declares that plastic cooling-tower sprayer nozzles classified at 8424.89.90 are covered by Schedule 4 Item 50 from 21 August 2009 until revoked. Mechanically, it changes the customs duty treatment for that narrowly defined imported good. Who pays/benefits: importers of the listed nozzles receive the tariff concession; Customs administers and may revoke under the statutory delegation (s269P; revocation under ss269SC/269SD). The measure lowers import cost for the specified item and creates a small compliance task to claim and verify the concession.